Press for making tubes.



0. SCHLENSTEDT.

PRESS FOR MAKING TUBES.

APPLICATION FILED'NOV, 13, 1913.

Patented Aug. 17, 1915.

2 SHEETSSHEET I.

0. SCHLENST EDT.

PRESS FOR MAKING TUBES.

APPLICATION FILED NOV, 13. I913.

1,150,,394.. Patented Aug. 17, 1915.

2 SHEETSSHEET 2.

travels together with the press plunger until 7 I at nnirnn srarns OSWIG SHLENSTEDT, (IFDUISBURG, GERMANY.

PRESS FOR MAKING TUBES.

Specification of Letters Patent.

To all whom it may concern:

Be it known that I, OSWIG SoHLENsTEnr, engineer, a subject of theEmperor of Germany, residing at Duisburg, Rhine, Germany, have invented certain new and useful; Improvements in Presses for Making Tubes,

of which the following is a specification.

The present invention relates to an iniprovement in tube presses of the kind in which for perforating the block of metal and for forming the tube a mandrel is employed which is held stationary afterthe block of metal has been perforated, as soon as its front end has entered so far into the (lie, that the forming of the tube is possible.

In the hitherto known presses of the afore-' mentionedikind a separate cylinder arranged within the press plunger or behind the press cylinder is provided for operating the mandrel. In the former instance this cylinder the perforation has been completed and the perforating mandrel has been rendered stationary, whereupon the cylinder within the press plunger advances over the perforating plunger in connection with .the mandrel.

In the other instance the perforating mandrel is advanced independently of the press plunger and, as soonas it has been rendered stationary, the pressRplunger is advanced independently. These presses-necessitate a very complicated gearing,- so that their economy is, in many instances, rendered doubtful,

According to the present improvement the mandrelyis likewise provided with one or several cylinders, but these cylinders at the same time serve as idlers or cylindersfor the inoperative stroke of the press ram, and

as soon as. the perforating ram has been rendered stationary, the press ram can pass over it, without any reversal of the operating gear for the supply or discharge pipes of the perforating mandrel being necessary.

In the accompanying drawing an embodiment of this improvement is exemplified in Figures 1 to 3 in diagram and in three different operative positions.

In these drawings axis the to which also the cylinders 72 h for the perforating punch 7 may be connected.

c is the press plunger, d the cross head of the latter and e the press ram connected to (Z. 7 is the combined perforating punch and mandrel; the crosshead g of which is con press cylinder,

- is released tothe action of of the plungers nected to the inders b.

r z' is the withdrawing cylinder, the piston 70 of which is coupled by the rods m. with the crosshead d of the press ram.

n is the container, r-is the block of metal, 8' is the matrix and w, 00 are stops for the crosshead of the mandrel 7. These stops may be adjustable.

he operation of the arrangement is as follows: When the metal block 1 is being introduced into the container '12., the press cylinder a must be connected with the supply pipe, while the withdrawing cylinder 11 connects with the discharge pipe or with an accumulator. The perforating Cylinders 6 are put under pressure,'so that the perforating punch f advances; the crosshead (Z with the press plunger 0, the press ram e, the rod gear m and thewithdrawing piston is participating in such advance. After the block has been introduced into the container and hasbeen perforated, the perforating punch or mandrel f has the position shown in Fig. 2, its crosshead g abutting against the stops m. Now the press cylinder a is put under pressure so that the crosshead d with the press ram e and the withdrawing piston k alone advances until the whole block has been pressed out in form of a tube y. Thereupon the {cylinders a and b are brought into connection with the discharge pipe and the withdrawing cylinder 6 is put under pressure or the withdrawing piston is the pressure prevailing in 11. Then the crosshead a? with the parts connected thereto will first return until it abuts against the crosshead 9. Thereupon also the pistons 7i and the perforating punch or mandrel f are returned into their initial position, as shown in Fig.1.

,1 claim:

1. A two-stage tube press having a ram, a combined punch and mandrel and a die plungers it working in the cyl- Patented Aug. 17, 1915.

therefor; means for advancing said punch during the first stage of operation, other means for advancing the ram during the second stage of operation, means for arresting .said punch during said second stage, and means for retracting said ram; said punch engaging with said ram during said first stage to drive the ram forward and said I ram engaging with said punch to retract the punch. v 2. In a tube press having a main ram, a

punch and a corresponding die, said punch also serving as mandrel, means for advancing the ram and the punch together while the hole is being punched in the blank and other means forsubsequently advancing said ram alone, means for subsequently retaining the punch in fixed position while the ram continues to advance to finish the tube and other means for retracting said ram, said punch engaging with said ram during the punching movement and said ram engaging with said punch during its retracting movement, thereby retracting the punch.

3. In a tube press having a main'ram, a punch and a corresponding die, said punch also serving as mandrel; a housing having separate working cylinders with pistons for the ram and the punch, said punching cylinder and piston causing simultaneous advancement of the punch and the ram during the first part of the forward stroke while the cylinder and piston for said ram remain idle; abutment members for the punch holding said punch stationary while said ramcylinder and piston are active during the latter part of the forward stroke of the ram.

4. In a tube press having a main ram, a punch and a corresponding die, said punch also serving as mandrel; a stationary housing having separate working cylinders with pistons for the ram and the punch, said punch-piston and cylinder working alone during the first part and said ram-piston and cylinder working alone during the sec- 0nd part of the pressing stroke; a cross head each for said ram and said punch rigidly connecting them with their respective p stons, and a retracting cylinder connected with said ram cross head, said cross heads inter-engaging during the first part of the pressing stroke and the last part of the retracting stroke.-

5. In a tube press having a main ram, a punch and a corresponding die, sald punch also serving as mandrel; separate worklng cylinders in a common stationary housing with pistons for the ram and the punch; a cross head each for said ram and said punch rigidly connecting them with their respective pistons and inter-engaging during the first part of the forward stroke but disengaging during the last part of said stroke, and "a retracting cylinder connected with said ram cross head; abutment members engaging with said punch cross head after completion of its forward stroke and retaining the punch cross head in fixed position during the completion of the forward stroke of said ram, said cross heads inter-engaging during the first part of the pressing stroke and the last part of the retracting stroke.

The foregoing specification signed at Barmen, Germany this 31st day of October, 1913.

' OSWIG SCHLENSTEDT. [1,. ea]

In presence of- HELEN NU'FER, ALBERT NUFER. 

